Emergency alarm device

Details Emergency alarm device Emergency alarm device

1977-01-21

1979-01-09

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340167A, 340348, 325 39, 325142, 325364, G08B 310

Patent

active

041341082

ABSTRACT:
A portable and addressable emergency alarm device which transmits a selected radio frequency alarm signal from a portable transmitter to a stationary receiver and sounds an alarm.

REFERENCES:
patent: 3629837 (1971-12-01), Fraunfelder
patent: 3868573 (1975-02-01), Holcomb et al.
patent: 3906348 (1975-09-01), Willmott
patent: 3909826 (1975-09-01), Schildmeirer et al.

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